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Title: Heteroepitaxial growth of MgO(111) thin films on Al2O3(0001): Evidence of a wurtzite to rocksalt transformation
Author: Martínez Boubeta, José Carlos
Botana, Antía S.
Pardo, Víctor
Baldomir, Daniel
Antony, Aldrin
Bertomeu i Balagueró, Joan
Rebled, J. M. (José Manuel)
López-Conesa, Lluís
Estradé Albiol, Sònia
Peiró Martínez, Francisca
Keywords: Pel·lícules fines
Òxids metàl·lics
Estructura electrònica
Thin films
Metallic oxides
Electronic structure
Issue Date: 2012
Publisher: American Physical Society
Abstract: We report on a growth study of MgO films deposited on Al2O3(0001) substrates by magnetron sputtering. The films exhibited a preferred rocksalt MgO(111) orientation. Surprisingly, depending on the O2 gas flow ratio, a structure of graphiticlike wurtzite MgO(0001) has been revealed. The observed Mg-O perpendicular bond length reduction is accompanied by an atomically flat surface morphology for the development of MgO(111) films; the transition to the bulk rocksalt structure occurs in the 3-6 nm coverage range. Previously, relaxation of the electrostatic instability of MgO(111) films accompanied by an in-plane lattice increase has been suggested theoretically [Phys. Rev. Lett. 98, 205701 (2007)]. Here, relying on ab initio calculations, we infer that Mg vacancies facilitate the lattice match with the substrate. This mechanism suggests methods to engineer oxide heterostructures.
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It is part of: Physical Review B, 2012, vol. 86, num. 4, p. 041407-1-041407-5
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ISSN: 1098-0121
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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